How much and what kind of antifreeze should I use

Just about any 50/50 mix will do. As for the capacity it should be listed in your owners manual. If not, fill radiator and fill reservoir turn engine on and check reservoir level and fill as needed to keep at operating level. Parts store will assist you with amount for your vechicle.

1 gallon of the traditional greenish color coolant. Prestone, peak and name brand will work. The balance with water checking for air and full capapcity when at normal temps.